After reading your original post, I realized you wanted a Jornada 720 version of Pocket Hexen and Heretic. Like Rob said, the HPC (which is what the 720 is) is not the same as the PPC. I wish I had a Jornada 720 port but like Rob said, they didn't make one. Sorry about that.
I think the HPC 2000s rock and it's too bad that PPC games and apps won't run on them. My game is also for PPC and not HPC so don't worry about checking it out. I have the SDK for the HPC and I am currently working on an updated version of my game, so I might just go ahead and make a HPC version of it also. Maybe I can get Rob or Courtney or someone else with a HPC to beta test for me. Sorry about Pocket Hexen and Pocket Heretic. If I had more programming skills, time, and a HPC to test on (which you really need for something as complex as Hexen or Heretic), I would gladly port a version, but I don't.